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Stockholders' Equity - Summary of Vested and Unvested Options, Weighted Average Exercise Price per Share, Weighted Average Remaining Term and Aggregate Intrinsic Value (Detail) (USD $)
 12 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of Shares, Vested 1,878,695
Number of Shares, Unvested 455,631
Number of Shares, Total 2,334,326
Weighted Average Exercise Price Per Share, Vested $ 3.94
Weighted Average Exercise Price Per Share, Unvested $ 4.80
Weighted Average Exercise Price Per Share, Total $ 4.11
Weighted Average Remaining Contractual Life, Vested 5 years
Weighted Average Remaining Contractual Life, Unvested 7 years 3 months 29 days
Weighted Average Remaining Contractual Life, Total 5 years 5 months 16 days
Aggregate Intrinsic Value, Vested $ 1,090,096
Aggregate Intrinsic Value, Unvested 8,084
Aggregate Intrinsic Value, Total $ 1,098,180